.node-panel {
  width: 250px;
  border-right: 1px solid #d9d9d9;
  padding: 16px;
  background-color: #fafafa;
  flex-shrink: 0;
}

.panel-title {
  font-size: 1.2em;
  font-weight: bold;
  margin-bottom: 8px;
}

.panel-description {
  font-size: 0.9em;
  margin-bottom: 16px;
  color: #888;
}

.node-category {
  font-weight: bold;
  margin-top: 20px;
  margin-bottom: 10px;
  color: #333;
  border-bottom: 1px solid #eee;
  padding-bottom: 5px;
}

.dnd-node {
  padding: 10px 20px;
  border: 1px solid #b1b1b7;
  border-radius: 4px;
  margin-bottom: 10px;
  cursor: grab;
  background-color: white;
  font-weight: 500;
  text-align: center;
  border-left-width: 5px;
}

.dnd-node:active {
  cursor: grabbing;
}

/* Node Type Colors */
.dnd-node.data-node {
  border-left-color: #007bff; /* Blue */
}
.dnd-node.pre-node {
  border-left-color: #ffc107; /* Yellow */
}
.dnd-node.train-node {
  border-left-color: #28a745; /* Green */
}